Maine Sen. Olympia Snowe to retire in blow to GOP

In announcing her plans, Snowe, 65, emphasized that she is in good health and was prepared for the campaign ahead. But she said she was swayed by the increasing polarization in Washington.

“Unfortunately, I do not realistically expect the partisanship of recent years in the Senate to change over the short term,” Snowe said in a statement. “So at this stage of my tenure in public service, I have concluded that I am not prepared to commit myself to an additional six years in the Senate, which is what a fourth term would entail.”

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